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Build opencv from source

#opencv   #build   #source  

Table of Content

Build opencv from source#

Build opencv include python binding from source on ubuntu 22.04 build and install opencv python binding into python virtual env

prerequisite#

source#

clone from github

configure#

show all build options
cmake -LA

ffmpeg#

!!! Set ffmpeg support to OFF There an error in build process for more information check …

gstreamer#

-D WITH_GSTREAMER=ON

Tip

sudo apt install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev

build into virtual environment#

create venv
python3 -m venv venv
source venv/bin/activate

pip install numpy

cmake -LA | grep -i python3
#
BUILD_opencv_python3:BOOL=ON
PYTHON3_EXECUTABLE:FILEPATH=/usr/bin/python3
PYTHON3_INCLUDE_DIR:PATH=/usr/include/python3.10
PYTHON3_LIBRARY:FILEPATH=/usr/lib/x86_64-linux-gnu/libpython3.10.so
PYTHON3_NUMPY_INCLUDE_DIRS:PATH=/usr/lib/python3/dist-packages/numpy/core/include
PYTHON3_PACKAGES_PATH:STRING=lib/python3.10/dist-packages

one liners#

# find executable path
python -c "import sys; print(sys.executable)"
# find lib path
python3 -c "import sysconfig; print(sysconfig.get_paths()['purelib'])"
# find include
python3 -c "import sysconfig; print(sysconfig.get_paths()['data'] + '/include')"
# numpy include
python3 -c "import numpy; print(numpy.get_include())"
# python install path
python3 -c "import sysconfig; print(sysconfig.get_paths()['purelib'])"

init cmake arguments#

-D BUILD_opencv_python3=ON \
-D PYTHON3_EXECUTABLE=`python -c "import sys; print(sys.executable)"` \
-D PYTHON3_INCLUDE_DIR=`python3 -c "import sysconfig; print(sysconfig.get_paths()['data'] + '/include')"` \
-D PYTHON3_NUMPY_INCLUDE_DIRS=`python3 -c "import numpy; print(numpy.get_include())"` \
-D PYTHON3_PACKAGES_PATH=`python3 -c "import sysconfig; print(sysconfig.get_paths()['purelib'])"` \
-D OPENCV_PYTHON3_INSTALL_PATH=`python3 -c "import sysconfig; print(sysconfig.get_paths()['purelib'])"` \

final#

cmake \
-D CMAKE_BUILD_TYPE=RELEASE  \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D WITH_FFMPEG=OFF \
-D BUILD_JAVA=OFF \
-D BUILD_opencv_python3=ON \
-D WITH_GSTREAMER=ON \
-D OPENCV_GENERATE_PKGCONFIG=ON \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D INSTALL_C_EXAMPLES=OFF \
-D BUILD_EXAMPLES=ON \
-D PYTHON3_EXECUTABLE=`python -c "import sys; print(sys.executable)"` \
-D PYTHON3_INCLUDE_DIR=`python3 -c "import sysconfig; print(sysconfig.get_paths()['data'] + '/include')"` \
-D PYTHON3_NUMPY_INCLUDE_DIRS=`python3 -c "import numpy; print(numpy.get_include())"` \
-D PYTHON3_PACKAGES_PATH=`python3 -c "import sysconfig; print(sysconfig.get_paths()['purelib'])"` \
-D OPENCV_PYTHON3_INSTALL_PATH=`python3 -c "import sysconfig; print(sysconfig.get_paths()['purelib'])"` \

..

examples#

all examples install in /usr/local/share/opencv4/samples/python

Reference#